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 ** This file is part of the examples of the Qt Toolkit.
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#include <QScrollArea>
#include <QScrollBar>
#include <QAction>
#include <QLabel>
#include <QWheelEvent>
#include "image_viewer.h"
#include <stdio.h>

ImageViewer::ImageViewer()
{
	imageLabel = new QLabel("<i>Waiting occupancy map...</i>");
	imageLabel->setFrameStyle(QFrame::StyledPanel | QFrame::Sunken);
	imageLabel->setAlignment(Qt::AlignCenter);
	imageLabel->setSizePolicy(QSizePolicy::Ignored, QSizePolicy::Ignored);
	imageLabel->setScaledContents(true);

  setFrameStyle(QFrame::StyledPanel | QFrame::Sunken);
	setAlignment(Qt::AlignCenter);
	setSizePolicy(QSizePolicy::Ignored, QSizePolicy::Ignored);

	scaleFactor = 1.0;
	setWidget(imageLabel);
}

QScrollArea *ImageViewer::getScrollArea() {
  return this;
}

QLabel *ImageViewer::getQLabel() {
  return imageLabel;
}

void ImageViewer::zoomIn()
{
	scaleImage(1.25);
}

void ImageViewer::zoomOut()
{
	scaleImage(0.8);
}

void ImageViewer::normalSize()
{
	imageLabel->adjustSize();
	scaleFactor = 1.0;
}

void ImageViewer::scaleImage(double factor)
{
	if (!imageLabel->pixmap()) {
		return;
	}
	scaleFactor *= factor;
	imageLabel->resize(scaleFactor * imageLabel->pixmap()->size());

	//adjustScrollBar(scrollArea->horizontalScrollBar(), factor);
	//adjustScrollBar(scrollArea->verticalScrollBar(), factor);

	//zoomInAct->setEnabled(true);
	//zoomOutAct->setEnabled(true);
}

void ImageViewer::adjustScrollBar(QScrollBar *scrollBar, double factor)
{
	scrollBar->setValue(int(factor * scrollBar->value()
				+ ((factor - 1) * scrollBar->pageStep()/2)));
}

void ImageViewer::wheelEvent(QWheelEvent *event) {
	if (event->delta() > 0) {
    zoomIn();
	}
  else {
    zoomOut();
	}
	event->accept();
}
